Pretreatment is to adjust oil seeds into best state before pressing or solvent extraction. Mainly includes cleaning, crushing, softening, flaking, puffing, cooking, drying, etc. Different oil seeds need different pretreatment process, and then use oil press machine to get oil out.

Solvent extraction plant is to use N-hexane to extract oil from the processed oil seeds or cakes. According to the oil content of oil seeds, different oilseeds need process through different methods ahead of time. After solvent extraction, the oil residue can be lower than 1%.

Edible oil refinery plant is to refine the crude oil got from pressing and solvent extraction plant. Only after refining can the crude oil be edible oil. DOING Company can provide three types of edible oil refinery plant--batch type, semi-continous and full-continous, according to the customers' requirement.